Update at 10:25 a.m. ET: The school's website says three young people attending a camp at Virginia Tech reported seeing a man holding what may have been a handgun, the Associated Press reports.

They said it was covered by a cloth or covering of some sort, and that the man was walking in the direction of the volleyball courts.

Lynn Davis, a spokesperson for the school, tells CNN the man is described as a white male, with light-brown hair, wearing a blue-and-white striped shirt. He is also wearing shorts and sandals, she says.

Law enforcement officers from Virginia Tech, Blacksburg, Christiansburg and Montgomery County were patrolling the campus, continuing to look for the subject.